Produced exclusively in the limited area of the Val Grana which comprises the three municipalities of Castelmagno, Pradleves and Monterosso Grana. Its DOC status was awarded in 1982. The alpine pasture production is limited to one single cheese maker. There are innumerable imitations in the surrounding villages and valleys which frequently bear names alluding or similar to ‘Castelmagno’. Unfortunately, the current trend is to retail it whilst still very fresh and not marbled although it is only after a correct ageing of at least six months that this wonderful cheese truly reveals its exceptional qualities.